what the heck is this?what is it for? how do you delete stuff for more memory? can you delete the ones without the pics?

I'm going to take this post seriously and assume its not a troll.

1) It's an application called Activity Monitor. (duh)

2) It's for monitoring running processes on your system, both user-level and system-level.

3) It sounds like you're asking a wildly different question here. If you want to free up space on your hard drive, drag files to your trash can and then empty it. If you want to free up RAM, then quit some of your open applications. You can't delete anything from within Activity Monitor.

4) Once again, you can not delete anything from within Activity Monitor. However you can quit some open applications to make some more RAM available. "The ones without the pics" -- I assume you are referring to system-level processes that don't have the pretty icons? I believe you can force quit these the same way, but I would recommend 100% against it. OS X is not simply one application running, it is a concert of many different applications, many of which are assumed to be there and will cause disastrous failure if they are not running. For example, one of the processes is called "WindowManager" or "WindowServer" or something like that -- I'm not at my Mac right now, I'm just going off of memory. That process is what all other applications call to manage and display their graphical interfaces. If you were to force quit that application, I suspect that your machine would lock up instantly and nothing other than a reboot would fix it.

As somebody else, don't mess around with things that you don't understand 100%. You will eventually break something important and it will be difficult to fix.